Bartłomiej Zimoń

Are you using ELClient lib?

Please try to adjust proper baud rate, it looks like not 115200, than past log here

this is with 115200: ``` ets Jan 8 2013,rst cause:2, boot mode:(3,7) load 0x40100000, len 29960, room 16 tail 8 chksum 0xfd load 0x3ffe8000, len 2140, room 0 tail 12...

Are you sure it is sent by serial?

@JackBlair87 This teensy uses USB as a programming interface and esp-link is a serial bridge. We need to ask @PaulStoffregen if serial programming is possible and how to proceed. The...

@PaulStoffregen thanks for the clarification. So as an alternative option is to mimic USB host device with https://github.com/PaulStoffregen/teensy_loader_cli

For flashing mega board with 2560 you should use megaflash script, it uses different api to support stk500v2 bootloader. Do you need more details ?

What are your boards and how did you connect to esp-link, in my opinion tx line is in collision with usb bridge if you use Arduino Mega, there is a...

So there is a conflict between usb bridge chip on mega board and esp-link on rx/tx lines

This is first solution Second is to use level shifter And third use such connections: ``` Mega - ESP GND-G 3V3-3V TX(pin1) - RX RX(pin0) - rectifier diode like eg.1N4007...